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Financial Derivative Instruments - Fair Values by Balance Sheet Location (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Gross amounts of recognized assets | $ 134 | $ 223
Gross amounts of recognized liabilities | 2 | 0
Fuel derivative contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Gross amounts of recognized assets | 24 | 86
Gross amounts of recognized liabilities | 6 | 15
Cash collateral deposits held from counterparties for fuel contracts | 4 | 15
Fuel derivative contracts | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Gross amounts of recognized assets | 110 | 137
Gross amounts of recognized liabilities | 18 | 35
Cash collateral deposits held from counterparties for fuel contracts | 18 | 35
Fuel derivative contracts | Accounts and other receivables |  |
Derivatives, Fair Value [Line Items] |  |
Receivable from third parties for fuel contracts | 1 | 12
Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Gross amounts of recognized assets | 127 | 223
Gross amounts of recognized liabilities | 0 | 0
Designated as Hedging Instrument | Fuel derivative contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Gross amounts of recognized assets | 17 | 86
Gross amounts of recognized liabilities | 0 | 0
Designated as Hedging Instrument | Fuel derivative contracts | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Gross amounts of recognized assets | 110 | 137
Gross amounts of recognized liabilities | 0 | 0
Not Designated as Hedging Instrument | Fuel derivative contracts | Prepaid expenses and other current assets |  |
Derivatives, Fair Value [Line Items] |  |
Gross amounts of recognized assets | 7 | 0
Gross amounts of recognized liabilities | $ 2 | $ 0

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